Animals with a three-chambered heart would include Amphibians.
- Amphibians have three-chambered which comprises of two Atria and one ventricle. Examples of Amphibians include Frog, Toads, Salamanders.
- In Amphibians heart blood from the single ventricle travels to the lungs, skin, and body, where it is oxygenated. Before being pumped out of the heart, deoxygenated and oxygenated blood are mixed in the ventricle.
- This is because the Amphibians have low rate of metabolism and thus requires less oxygen for their metabolism.
- As a result heart's load to deliver oxygenated blood to body is lowered.
Thus, from the above pointers we can conclude that only Amphibians from the option have three-chambered heart. 
Learn more about Amphibians:
brainly.com/question/27961653
#SPJ4
 
        
             
        
        
        
The answer is:  "2A" or "IIA" or "2" or "II"; 
___________________________________
In which "II" stands for the Roman numeral representing the number: "2 (two)".
________________________________________________________
        
             
        
        
        
Answer:
Bioremediation uses micro-organisms to reduce pollution through the biological degradation of pollutants into non-toxic substances. This can involve either aerobic or anaerobic micro-organisms that often use this breakdown as an energy source.
 
        
             
        
        
        
PCR multiplies the DNA in 25 to 75 cycles
        
                    
             
        
        
        
The answer is D, moist skin surfaces. 
Explanation: 
Cnidaria and flatworms respirate and extreme through their skin via diffusion.